2010•Xi'an Gongcheng Keji Xueyuan xuebaoRequires access

Non-driver communication of MODBUS RTU slave protocol based on CP341 module

Xia Gao

Abstract

In SIEMENS PLC communication system,to conquer the defect of realizing MODBUS RTU slave protocol communication with hardware drive,a non-driver communication of MODBUS RTU slave protocol is proposed.STEP 7 program based on the MODBUS RTU message format was taken to realize the non-driver communication of MODBUS RTU slave protocol on the basis of ASCII communication mode of CP341 point-to-point communication module.The design of data communication program between CP341 and DCS is discussed.In a practical communication system,PLC with MODBUS RTU slave protocol is connected to DCS.Compared with the use of MODBUS RTU protocol conversion card,software programming has strong flexibility and generalization.

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Key concepts: Modbus, ASCII, Communications protocol, Embedded system, Protocol (science), Computer science, Synchronous serial communication, Flexibility (engineering)